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Output chokes
Description
dU/dt output chokes (also known as output chokes or du/dt filters) are installed downstream of frequency converters or pulse inverters, i.e. between the converter and the motor.
They are designed to limit the rate of voltage rise (du/dt) at the motor output.
'du/dt' means: the change in voltage over time (in V/µs).
Frequency converters generate steep-edged PWM voltages (pulse width modulation), which cause very rapid voltage rises.
With long motor cables or sensitive motor windings, these steep voltage peaks can:
Generate overvoltages at the motor terminals (due to reflections in the cable),
Cause insulation damage to the motor windings,
Cause bearing currents and electromagnetic interference (EMC problems),
Significantly shorten the service life of the motor.
Use of choke or sine wave filter:
for cable lengths <5m: du/dt filter
for cable lengths 5-20m: du/dt choke
for cable lengths >20m: sine wave filter
Series Specifications
Rated voltage Un
3x400V
Nominal frequency fn
50 Hz
resonant frequency fr
5-70 Hz
Clock frequency ft
4-12 kHz
Auswahlfilter
Versions
| Artikel-Nr | Bild | rated current (A) | Motor power (kW) | Nominal induction (mH) | Typical power loss (W) | Weight approx. (kg) |
Price incl. vat |
|---|---|---|---|---|---|---|---|
| 4511.0939 |  | 2.1 | 0.75 / 0.8 | 2,800 | 20 | 1.2 | 227,46 € |
| 4511.0940 | | 4.0 | 1.5 | 1.470 | 22 | 1.2 | 232,16 € |
| 4511.0941 | | 7.8 | 3.0 | 0.754 | 25 | 1.2 | 243,69 € |
| 4511.0942 | | 10.0 | 4.0 | 0.588 | 30 | 1.8 | 253,46 € |
| 4511.0943 | | 14.0 | 5.5 / 6.5 | 0.420 | 34 | 2.2 | 272,58 € |
| 4511.0944 | | 17.0 | 7.5 | 0.346 | 38 | 2.5 | 290,84 € |
| 4511.0945 | | 24.0 | 11.0 | 0.245 | 45 | 2.5 | 290,84 € |
| 4511.0946 | | 32.0 | 15.0 | 0.184 | 55 | 3.9 | 397,41 € |
| 4511.0947 | | 45.0 | 18.5 / 22.0 | 0.131 | 60 | 6.1 | 450,88 € |
| 4511.0948 | | 60.0 | 30.0 | 0.098 | 65 | 6.1 | 510,95 € |
| 4511.0949 | | 72.0 | 37.0 | 0.082 | 70 | 6.1 | 579,84 € |
| 4511.0950 | | 90.0 | 45.0 | 0.065 | 75 | 7.4 | 715,87 € |
| 4511.0951 | | 110.0 | 55.0 | 0.053 | 90 | 8.2 | 795,36 € |
| 4511.0952 | | 124.0 | 63.0 | 0.047 | 110 | 8.2 | 804,19 € |
| 4511.0953 | | 143.0 | 75.0 | 0.041 | 115 | 10.7 | 866,02 € |
| 4511.0954 | | 156.0 | 90.0 | 0.038 | 120 | 10.7 | 903,11 € |
| 4511.0955 | | 170.0 | 100.0 | 0.035 | 130 | 10.7 | 961,41 € |
| 4511.0956 | | 182.0 | 110.0 | 0.032 | 140 | 16.0 | 1.037,37 € |
| 4511.0957 | | 230.0 | 132.0 | 0.026 | 180 | 22.0 | 1.395,98 € |
| 4511.0958 | | 280.0 | 160.0 | 0.021 | 220 | 29.0 | 1.556,73 € |
| 4511.0959 | | 330.0 | 200.0 | 0.018 | 240 | 32.0 | 1.705,13 € |
| 4511.0960 | | 400.0 | 250.0 | 0.015 | 330 | 34.0 | 2.116,74 € |
| 4511.0961 | | 500.0 | 315.0 | 0.012 | 340 | 35.0 | 2.332,25 € |
| 4511.0962 | | 600.0 | 355.0 | 0.010 | 380 | 37.0 | 2.411,75 € |
| 4511.0963 | | 680.0 | 375.0 / 400.0 | 0.009 | 410 | 38.0 | 2.777,41 € |
| 4511.0964 | | 790.0 | 450.0 | 0.007 | 590 | 43.0 | 3.498,17 € |
| 4511.0965 | | 910.0 | 500.0 | 0.006 | 740 | 49.0 | 3.851,47 € |
| 4511.0966 | | 1100.0 | 600.0 | 0.005 | 760 | 66.0 | 4.540,42 € |
| 4511.0967 | | 1500.0 | 800.0 | 0.004 | 1045 | 97.0 | 6.435,92 € |
| 4511.0968 | | 1920.0 | 1000.0 | 0.003 | 1090 | 105.0 | 7.296,22 € |
| 4511.0969 | | 2300.0 | 1250.0 | 0.002 | 1160 | 108.0 | 8.232,49 € |